Python/Kivy：将 TextInput 文本从一个类传递到另一类

Question

当我运行test.py 然后显示name TextInput。当我输入TextInput 然后显示Tree View 和filterTextInput。当我在filterTextInput 中输入内容时，它根据类型@987654326 显示结果@.
但我想当有人输入 name TextInput 然后输入 keyword 放入 filter TextInput 并且结果应该根据 pass keyword 显示。

test.py

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.uix.popup import Popup
from kivy.uix.treeview import TreeView, TreeViewLabel, TreeViewNode
from kivy.uix.label import Label
from kivy.properties import ObjectProperty
Window.size = (500, 400)


def populate_tree_view(tree_view, parent, node):
    if parent is None:
        tree_node = tree_view.add_node(TreeViewLabel(text=node['node_id'],
                                                     is_open=True))
    else:
        tree_node = tree_view.add_node(TreeViewLabel(text=node['node_id'],
                                                     is_open=True), parent)

    for child_node in node['children']:
        populate_tree_view(tree_view, tree_node, child_node)



class TreeViewLabel(Label, TreeViewNode):
    pass


class TreeviewGroup(Popup):
    treeview = ObjectProperty(None)
    tv = ObjectProperty(None)
    popup = ObjectProperty()

    def __init__(self,obj, **kwargs):
        super(TreeviewGroup, self).__init__(**kwargs)
        self.tv = TreeView(root_options=dict(text=""),
                       hide_root=False,
                       indent_level=4)

        rows = [('test{}').format(i) for i in range(1, 20)]

        tree = [{'node_id': r, 'children': []} for r in rows]

        self.tv.bind(minimum_height=self.treeview.setter('height'))
        for branch in tree:
            populate_tree_view(self.tv, None, branch)
        self.treeview.add_widget(self.tv)

    def filter(self, f):
        #self.ti.text = "text12"
        self.treeview.clear_widgets()
        self.tv = TreeView(root_options=dict(text=""),
                           hide_root=False,
                           indent_level=4)

        rows = [('test{}').format(i) for i in range(1, 20)]

        tree = []

        for r in rows:
            tree.append({'node_id': r, 'children': []})
        new_tree = []
        for n in tree:
            if f.lower() in n['node_id'].lower():
                new_tree.append(n)
        for branch in new_tree:
            populate_tree_view(self.tv, None, branch)

        self.treeview.add_widget(self.tv)

    def remove_widgets(self):
        for child in [child for child in self.treeview.children]:
            self.treeview.remove_widget(child)


class GroupScreen(Screen):
    name = ObjectProperty(None)
    popup = ObjectProperty(None)

    def display_groups(self, instance):
        if len(instance.text) > 0:
            if self.popup is None:
                self.popup = TreeviewGroup(self)
            self.popup.open()


class Group(App):
    def build(self):
        self.root = Builder.load_file('test.kv')
        return self.root


if __name__ == '__main__':
    Group().run()

test.kv

#:kivy 1.10.0

<TreeViewLabel>:
    on_touch_down:
        app.root.name.text = self.text
        app.root.popup.dismiss()

<TreeviewGroup>:
    treeview: treeview
    title: "Select"
    title_size: 17
    size: 800, 800
    auto_dismiss: False
    scroll: scroll
    fltr : fltr

    BoxLayout
        orientation: "vertical"
        TextInput:
            id : fltr
            size_hint_y: .13
            on_text: root.filter(self.text)

        ScrollView:
            id: scroll
            size_hint: 1, .9


            BoxLayout:
                size_hint_y: None
                id: treeview

        GridLayout:
            cols: 2
            row_default_height: '20dp'
            size_hint: .5, 0.1
            pos_hint: {'x': .25, 'y': 1}
            Button:
                text: 'Ok'
                on_release: root.dismiss()

            Button:
                text: 'Cancel'
                on_release: root.dismiss()

<CustomLabel@Label>:
    text_size: self.size
    valign: "middle"
    padding_x: 5

<SingleLineTextInput@TextInput>:
    multiline: False

<GreenButton@Button>:
    background_color: 1, 1, 1, 1
    size_hint_y: None
    height: self.parent.height * 0.150

GroupScreen:
    name: name

    GridLayout:
        cols: 2
        padding : 30,30
        spacing: 10, 10
        row_default_height: '40dp'

        CustomLabel:
            text: ' '

        CustomLabel:
            text: ' '

        CustomLabel:
            text: 'Name'

        SingleLineTextInput:
            id: name
            text:' '
            multiline: False
            on_text: root.display_groups(self)



        GreenButton:
            text: 'Ok'

        GreenButton:
            text: 'Cancel'
            on_press: app.stop()

Answer 1

传递整个单词，例如keyword 或 0，将 on_text 替换为 on_text_validate。

干燥 - 不要重复自己

有重复代码，为了便于维护，我把它们变成了模块。

def create_treeview_root(self):
...
def create_treeview_branch(self, obj):
...
def dismiss_callback(self):

片段

GroupScreen:
    ...
        SingleLineTextInput:
            id: name
            focus: True
            multiline: False
            on_text_validate: root.display_groups(self)

示例

main.py

​​>

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.uix.popup import Popup
from kivy.uix.treeview import TreeView, TreeViewLabel, TreeViewNode
from kivy.uix.label import Label
from kivy.properties import ObjectProperty, StringProperty, ListProperty
Window.size = (500, 400)


def populate_tree_view(tree_view, parent, node):
    if parent is None:
        tree_node = tree_view.add_node(TreeViewLabel(text=node['node_id'],
                                                     is_open=True))
    else:
        tree_node = tree_view.add_node(TreeViewLabel(text=node['node_id'],
                                                     is_open=True), parent)

    for child_node in node['children']:
        populate_tree_view(tree_view, tree_node, child_node)


class TreeViewLabel(Label, TreeViewNode):
    pass


class TreeviewGroup(Popup):
    treeview = ObjectProperty(None)
    tv = ObjectProperty(None)
    filter_text = StringProperty('')
    tree = ListProperty([])

    def __init__(self, obj, **kwargs):
        super(TreeviewGroup, self).__init__(**kwargs)
        self.create_treeview_root()
        rows = [('test{}').format(i) for i in range(1, 20)]
        self.tree = [{'node_id': r, 'children': []} for r in rows]
        self.tv.bind(minimum_height=self.treeview.setter('height'))
        self.create_treeview_branch(self.tree)

    def create_treeview_root(self):
        self.tv = TreeView(root_options=dict(text=""),
                           hide_root=False,
                           indent_level=4)

    def create_treeview_branch(self, obj):
        for branch in obj:
            populate_tree_view(self.tv, None, branch)
        self.treeview.add_widget(self.tv)

    def on_open(self):
        self.filter_text = App.get_running_app().root.name.text

    def dismiss_callback(self):
        self.treeview.clear_widgets()
        self.dismiss()
        App.get_running_app().root.name.focus = True

    def filter(self, f):
        self.treeview.clear_widgets()
        self.create_treeview_root()
        new_tree = []
        for n in self.tree:
            if f.lower() in n['node_id'].lower():
                new_tree.append(n)
        self.create_treeview_branch(new_tree)


class GroupScreen(Screen):
    name = ObjectProperty(None)
    popup = ObjectProperty(None)

    def display_groups(self, instance):
        if len(instance.text) > 0:
            if self.popup is None:
                self.popup = TreeviewGroup(self)
            self.popup.open()


class Group(App):
    def build(self):
        self.root = Builder.load_file('test.kv')
        return self.root


if __name__ == '__main__':
    Group().run()

test.kv

#:kivy 1.10.0

<TreeViewLabel>:
    on_touch_down:
        app.root.name.text = self.text
        app.root.popup.dismiss_callback()

<TreeviewGroup>:
    treeview: treeview
    title: "Select"
    title_size: 17
    size: 800, 800
    auto_dismiss: False
    scroll: scroll
    fltr : fltr

    BoxLayout
        orientation: "vertical"
        TextInput:
            id : fltr
            focus: True
            text: root.filter_text
            size_hint_y: .13
            on_text: root.filter(self.text)

        ScrollView:
            id: scroll
            size_hint: 1, .9


            BoxLayout:
                size_hint_y: None
                id: treeview

        GridLayout:
            cols: 2
            row_default_height: '20dp'
            size_hint: .5, 0.1
            pos_hint: {'x': .25, 'y': 1}
            Button:
                text: 'Ok'
                on_release:
                    root.dismiss_callback()

            Button:
                text: 'Cancel'
                on_release:
                    root.dismiss_callback()

<CustomLabel@Label>:
    text_size: self.size
    valign: "middle"
    padding_x: 5

<SingleLineTextInput@TextInput>:
    multiline: False

<GreenButton@Button>:
    background_color: 1, 1, 1, 1
    size_hint_y: None
    height: self.parent.height * 0.150

GroupScreen:
    name: name

    GridLayout:
        cols: 2
        padding : 30,30
        spacing: 10, 10
        row_default_height: '40dp'

        CustomLabel:
            text: ' '

        CustomLabel:
            text: ' '

        CustomLabel:
            text: 'Name'

        SingleLineTextInput:
            id: name
            focus: True
            multiline: False
            on_text_validate: root.display_groups(self)

        GreenButton:
            text: 'Ok'

        GreenButton:
            text: 'Cancel'
            on_press: app.stop()

输出